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Dell Latitude e6440 Displayport flicker e-Port replicator
I have a Dell Latitude e6440 (Intel+AMD video) with the newest BIOS A18 and the newest video drivers. It is connected to an ePort Replicator 0PKDGR. I have a Displayport cable connected between the ePort and an ACER 43" 4k UltraHD monitor at 3840x2160.
When I resume the Laptop from sleep/standby/hibernate, the screen flashes bars and sometimes completely turns off for a few seconds.
If I reboot, then everything is fine.
I've tried:
- Making sure the bios and drivers are all up to date.
- I had an unrelated issue about 2 months ago, and my motherboard and cooling fan were replaced. So I'm assuming the motherboard is newer/better if there was ever a fix for this issue, but not entirely sure. Since the Intel/AMD graphics are on the motherboard. They were replaced. The issues remained before and after.
- Tried turning off hibernate. Using only regular standby. Issue persists.
- Tried turning off standby and only using Hibernate. Same issue
- It seems to happen more when the system is being used more. Cooling fan runs more often.
- Tried a different Displayport cable
- Tried a different displayport connection on the EPort, DP1 vs DP2
Might be a coincidence, but I was just trying something and switched my monitor from Displayport 1.2 to 1.1. The resolution of the display went down to 2k. Then I switch back to DP 1.2 and the issue seems to have gone away. I'm going to try this next time it happens.
So...I've seen threads on this.. I believe I tried everything on the other threads. Is it worth calling in? Would they replace the Motherboard differently for a display issue vs a cooling issue?
Is it possible that there is an issue with the eDock?
mogulman1
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September 19th, 2017 17:00
Ok...so the issue happened again today. This time, instead of changing displayport revisions, I just tried changing the display Resolution in Windows to 2560x1440. Then I changed it back to 3840x2160 and no flickering.
So it seems like something in the display drivers when it comes out of sleep.
robert p
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September 20th, 2017 05:00
Hi mogulman1,
Thanks for posting.
Does the same thing happen without the eDock? Here is some information you may find helpful: http://dell.to/2xmqqE1
mogulman1
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September 21st, 2017 08:00
Changing resolution doesn't seem to be an answer. Changing my monitor from Displayport 1.2 to 1.1, seems to fix the issue. I can't leave it as 1.1, because then the max resolution through displayport is only 2k.
So I change the monitor from Displayport 1.2 to 1.1 and then back again. This fixes it for a time until the next wakeup from sleep.
Rebooting the PC cures the issue as well.
So seems like a video driver/hardware issue on the laptop.
mogulman1
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September 21st, 2017 08:00
There is no Displayport connection on the laptop. Only on the e-dock. Also, the link you provided just talks about updating drivers and bios. I already said that I did that.